Transmitter-arm.



No. 761,671. l PATRNTRDTUNR?, 1904.

, H. Jh. GUTTMAN.

TRANSMITTER ARM.`

APPLICATION FILED DEO. 30. 1901.

N0 MODEL.

llllllllllllllllllllllll g y UNITED STATES Patented J une '7, 1904.

PATENT OFFICE.

HARRY J. GUTTMAN, or ciIIcAeo, ILLINOIS.

' ITRANSNIlTTER-ARM.

SPECIFICATION forming part of Letters Patent lil o. '761,671,1dated June 7, 1904. l Application filed December 30, 1901. Serial No. 87,7`06. (No model.)

To @ZZ whom if; may concern:

nying drawings, forming a part of this specification.

My invention relates to improvements in transmitter-arms adapted for use in connection with telephone subscribers instruments, and more particularly to the kind pivoted to a suitable pedestal whereby its forward end may be raised and lowered to accommodate persons of different heights.

One object of my invention is to provide a transmitter-arm with an enlarged forwardI end forming the casing or head of the transmitter, or, in other words, to form a combined transmitter arm and casing.

A second object-is to stamp such an integral arm and casing from sheet metal.

Another 'object is to provide atransmitterarm with a stamped sheet-metal base consisting of but two pieces, while other objects are the provision of a device of the character described which is of the ordinary appearance, but which is stronger and more rigid, which is simpler and cheaper to make, and which is provided with an unobstructed passage from end topend through and by which the transmitter cord or cords may be entirely concealed.

In accordance with my invention I provide in its preferred form a transmitter arm and casing composed of two longitudinal members stamped from sheet metal having their meeting faces lying in close proximity and conforming to yeach other, whereby said members may be readily joined together to form Aa cheap, light, .and strong transmitter arm and casing, the former being adapted to receive and conceal the conducting cord or cords,

vwhile the latter is adapted to receive the oplight, andhollow and may be utilized to conceal the transmitter-cords. The preferred form of the pedestal employs no pivot-screw, whereby a simple and cheap form of device results.

In the accompanying drawings, in which the same reference characters designate like parts throughout the several views, Figure 1 is a perspective view of the'preferred form of the invention. Fig. 1 is a section of the same on the line a a of Fig. 1. Fig. 2 is a plan View of a modified form. Fig. 3 is a sectionalplan view of the same.` Fig. L is a side View of one of the longitudinal members looking toward the inner face. Fig.- 5 is a perspective view of the standard of one form of pedestal. Fig. 6 is a perspective view lof the base of this pedestal.

The transmitter-arm is composed of the longitudinal members 2 and 3, of the proper form, with the meeting edges of the side flanges4 4 conforming to each other and comprising the edges of the arm when thetwo. members are secured together, as shown in Figs. 1, 2, and 3. The said members are provided at their forward ends with the enlarged and Haring portions 5 5, which ,when the two parts are secured together form a suitable cavity for the operative parts of the transmitter. This enlarged part, which is formed integrally with the arm, corresponds to the casing Vor head of the ordinary transmitter; but instead of being separated from the arm it is formed integral therewith. As shown'in Figs..1. 2, and 3,

' the arm is slightly bulged at 6 to strengthen the connection of the transmitter-casing with the arm and to provide more room at the forward portion of the central passage of the arm. The forward rim 7 of the portion 5 of the arm is threaded, and a cap 8, corresponding to the usual transmitter-cap, is adapted to be threadedover thepsame, the cap being provided with a central threaded aperture 9, in which the usual mouthpiece of the transmitter is secured. At the pivoted end of the arm the longitudinal members 2 and 3 of the arm are of circular form and are provided with a centrallyarranged projection 10 and with a raised rib 11, which is preferably circular and concentric with the projection 10, The side flanges are cut away at 12. as in Fig. 4, at the rear end to provide room for the passage of the conducting-wires.

It is apparent that the longitudinal members may be of castiron or cast-steel, so far as some features of my invention are concerned; but I prefer to stamp them from thin sheet metal by means of suitable dies, and this 1 also consider an important feature ot' my invention.

The preferred form of pedestal comprises a base formed of two pieces, each having a lat portion 13, with a rearwardly-eXtending rim 19 and a forwardly-extending pivot-ear 13", lhaving a depression 13cm its inner face, the said depressions being adapted to receive the projections 101L on the arm when the parts are all assembled. 'The portions 13 et' one of the basepieces has overlapping ears 13, while the other like piece has underlapping ears 13e. Apertures 13t are provided in said overlapping and underlapping ears, whereby when the parts are assembled, as in Fig. 1 and 1, and suit able screws passed therethrough the parts are securely held together. These parts are also preferably stamped, but may be cast, if desired. The other form of pedestal, Figs. 2, 3, 5, and 6, comprises the stamped sheet-metal base 13, of circular form and having theedge portions 19 extending toward the rear. Y The standard comprises a thin metal piece 14, eut and stamped into the form shown in Fig. 5, a single piece, as shown, being used and the meeting flanges 15 thereof conforming to each other and constituting one edge of the standard. Suitable lugs 16 are provided upon the edge of the standard 14, which are adapted to pass through suitable apertures in the face of the base 13 and are then upset or riveted on the inside of the same, as shown in Fig. 3. Apertures 17 are provided in the said base, through which screws are adapted to pass to secure it to the desired supporti. A central aperture 18 is also provided, through which the conducting-cores are adapted to pass, said aperture alining with the central passage ot' the hollow arm. The rim 19 of the base 13 has one or more apertures or notches 20, through which the conducting core or wires may be carried, or the latter 'may be extended through apertures provided in the support in the ordinary manner. The side members of the standard 14 are circular, as shown, at their forward ends and are provided with an aperture 21, which is centrally located.

While the longitudinal members 2 and 3 may be secured together' as desired, 1 deem it preferable to hold them in position merely by means of the scre\v tl1readed cap 8 and by means of the pedestal. As shown in Fig. 3, the cap 8 is adapted to secu rely clamp the forward ends of the. members together, while their rear ends are adapted to fit between thc side members of the standard 14 of the pedestal and to be at all times pressed together and held in proper position by means ot' the springwasher 2Q, located between one side member, such as 2, as shown in Fig. 3, and the adjacent side member et the standard 14. A pivoted screw 23 extends through the said membels and through suitable apertures 10, formed in the longitudinal members 2 and 3, and a. thumb-nut 24 is threaded upon one end oi the same, by means of which the said members of the standard 14 may be compressed and prevented rom opening, duc to the action of the spring-washer 2Q.

In the case of Figs. 1 and 1 the rear ends of the arm-pieces are held in the same manner by the side pieces 13" or' the pedestal` the latter being held in position by the securingscrews. The raised ribs 11, formed on the arm members, provide a goed bearing-sui, face, such as is desired `t'or the arm to hold it rigid and in the desired position at all times.

The operative parts el a transmitter are adapted to be located in the forward end 5 ol' the arm, as stated above. These parts may be of any desired construction and consist generally ot' a diaphragm 25 and a suitable electrode 26, operating in a chamber containing granular carbon or other linely-divided conducting material. 1n case the transmitter-arm forms one side of the circuit of the transmitter but one cond acting-core 27 passes through the center ofthe hollow arm. ln case, however, it is not desired to so use the arm both conducting-cords will be carried to the rear through the arm and through the aperture 18 into the base of the pedestal.

rlhe members 2 and 3 of the arm, as stated, as well as the members ot' both forms o1: bases, are formed by suitable dies in an ordinary stamping-press, as will be readily understood, and the longitudinal members may be secured together in any desired manner, as by screwing or soldering the edges ot' the [ianges together or in any other desired manner; but I prefer to merely secure them in the manner stated. The clamping action ofthe pedestal upon the two members olE the arm is suilieient to hold them in the desired position should it be desired to remove the cap S for the inspection et' the operative parts of the transmitter. The presence of the spring-washer 22 insures at all times a lirm and steady bearing lor the pivot of the arm and a good electrical contact between the pedestal and arm where it is desired to use these parts in the circuit. It is apparent that the ridges 11 in the arm may be formed in the side members ol the. standard 14 and accomplish the same result. rlhe Iconstruction shown, however, is provided, for

thereason that it is easier to manufacture and 1s ot better appearance. The iirst Al'orm described has no pivot-screw, and the parts are comparatively simple to make.

It will thus be seen that ll. have provided a transmitter-arm and a casing which is simple and cheap to manufacture and which is more IOO llO

durable and more convenient than the ordinary arrangements. While I have described the same with reference to the particular construction shown in the drawings, I do not desire to be so limited, and I hold it to include all suoli changes, variations,`and modifications Aas fully fall within its scope and principle.

That I claim, and desire to secure by' Letters Patent, is-

l. A combined transmitter arm and casing comprising two longitudinal members and a part forming the cap of the transmitter adapted to be secured to said transmitter-casing to hold the members together, substantially as described.

' 2. A combined transmitter arm and casing comprising two longitudinal members and a screw-threaded cap adapted to be secured to the forward end of said members to hold them together, said cap forming the front piece of the transmitter-casing, substantially as dei scribed.

each other, a pedestal in which one end of said arm is pivoted and by which the longitudinal members are pressed together, and a screwthreaded cap for the transmitter-casing adapted to secure the forward ends of said members together, substantially as described.

4. A transmitter-arm pedestal consisting of two parts having overlapping portions, each part having a forwardly-extending pivot-ear, and means to secure the said parts together through the medium of said overlapping parts, thesaid ears beingI in suitable position to receive the pivoted end of a transmitterarm,.

substantially as described.

5. A transmitter-arm pedestal comprising av base portion formed in two parts and having overlapping portions, each part having a forwardly-extending ear, and means yto secure said parts together and in position by means of said overlapping portions, the said pivotears being in a position to receive the pivoted end of a transmitter-arm, substantially as described.

6. A transmitter-arm pedestal comprising two members of stamped sheetv metal having overlapping'portions to enable the members to be secured together, each member having a forwardly-extending pivot-ear whereby when the two parts 4are secured together the pivot-ears are in position to receive the pivoted end of a transmitter-arm, substantially as described.

7. The combination with a transmitter-arm formed of two pieces, a base upon which said arm is pivoted. said base comprising two members adapted to be secured together and to,

hold the two parts ofthe arm in position, substantially as described.

i8. A combined transmitter arm and casing comprising two longitudinal members suitably joined together and enlarged at their forward end to provide a bell to receive the transmitter, and a cover for the end of said bell adapted to form the head or front piece of the transmitter-casing, said front piece having a central opening to accommodate the mouthpiece, the transmitter elements being adapted to be placed between said front piece and said bell-shaped enlargement of said members, substantially as described.

9. Atransmitter-arm comprising longitudinal members having the meeting edges thereof conforming to each other and providedwith outwardly-Haring forward ends constituting a bell-like casing adapted to envelop the transmitter, and means. uniting said members to form a hollow arm with the meeting edges of said members in contact with each other;

10. A transmitter-arm comprising longitudinal members of stamped sheet metal having the meeting edges thereof conforming to each other and provided with outwai'dly-iiaring forward. ends constituting a bell-like casing adapted to envelop the transmitter elements,

stamped sheet metal, and an arm pivoted upon l said base and comprising longitudinal members of sheet metal having the meeting edges thereof conforming to each otlierand providedwith outwardly-flaring forward ends constituting a bell-like casing for the reception of the transmitter, and means uniting said members to form a hollow arm with the meeting edges of said members arranged in contact.

13. In combination, a base composed of two parts of stamped sheet metal, and an arm pivoted upon said base and comprising longitudinal members of stamped sheet metal having the meeting edges thereof conforming to each other and provided with outwardly-flaring forward en ds constituting a bell-like casing, a cap for said casing, and the elements of a IOO IIO

transmittermounted upon said cap and arranged within said casing.

In witness whereof I have hereunto sub- M. R. Rooi-moin), ROBERT Lnwis AMES. 

